BASH错误：语法错误：预期的操作数（错误令牌为“”）

kbdev 发表于 Dev

kbdev

我是bash脚本的新手，我的一个脚本有问题。在从充满XML文件的文件夹中读取25岁以下的驱动程序的生日并计算其年龄之后，我试图组成一个25岁以下驱动程序的列表。一旦确定它们小于25，就将驱动程序数据的文件名保存到文本文件中。该脚本一直工作到一定程度，然后停止。我得到的错误是：

gdate: extra operand ‘+%s’
Try 'gdate --help' for more information.
DriversUnder25.sh: line 24: ( 1471392000 -  )/60/60/24 : syntax error: operand expected (error token is ")/60/60/24 ")

这是我的代码：

#!/bin/bash

# define directory to search and current date
DIRECTORY="/*.xml"
CURRENT_DATE=$(date '+%Y%m%d')

# loop over files in a directory
for FILE in $DIRECTORY;
do
  # grab user's birth date from XML file
  BIRTH_DATE=$(sed -n '/Birthdate/{s/.*<Birthdate>//;s/<\/Birthdate.*//;p;}' $FILE)

  # calculate the difference between the current date
  # and the user's birth date (seconds)
  DIFFERENCE=$(( ( $(gdate -ud $CURRENT_DATE +'%s') - $(gdate -ud $BIRTH_DATE +'%s') )/60/60/24 ))

  # calculate the number of years between
  # the current date and the user's birth date
  YEARS=$(($DIFFERENCE / 365))

  # if the user is under 25
  if [ "$YEARS" -le 25 ]; then
    # save file name only
    FILENAME=`basename $FILE`
    # output filename to text file
    echo $FILENAME >> DriversUnder25.txt
  fi
done

我不确定为什么它会正确输出前10个文件名然后停止。任何想法为什么会发生这种情况？

kbdev

问题是某些文件中有多个驱动程序，因此将多个出生日期导入到同一字符串中。我的解决方案如下：

#!/bin/bash

# define directory to search and current date
DIRECTORY="/*.xml"
CURRENT_DATE=$(date '+%Y%m%d')

# loop over files in a directory
for FILE in $DIRECTORY;
do
  # set flag for output to false initially
  FLAG=false

  # grab user's birth date from XML file
  BIRTH_DATE=$(sed -n '/Birthdate/{s/.*<Birthdate>//;s/<\/Birthdate.*//;p;}' $FILE)

  # loop through birth dates in file (there can be multiple drivers)
  for BIRTHDAY in $BIRTH_DATE;
  do
    # calculate the difference between the current date
    # and the user's birth date (seconds)
    DIFFERENCE=$(( ( $(gdate -ud $CURRENT_DATE +'%s') - $(gdate -ud $BIRTHDAY +'%s') )/60/60/24))

    # calculate the number of years between
    # the current date and the user's birth date
    YEARS=$(($DIFFERENCE / 365))

    # if the user is under 25
    if [ "$YEARS" -le 25 ]; then
      # save file name only
      FILENAME=`basename $FILE`
      # set flag to true (driver is under 25 years of age)
      FLAG=true
    fi
  done

  # if there is a driver under 25 in the file
  if $FLAG == true; then
    # output filename to text file
    echo $FILENAME >> DriversUnder25.txt
  fi
done